COMPARATIVE SPRING MIGRATION ARRIVAL DATES IN THE TWO MORPHS OF WHITE-THROATED SPARROW
| Autor: | Sarah S. A. Caldwell, Alexander M. Mills |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
education.field_of_study
Ecology Phenology Assortative mating Zonotrichia Population food and beverages Sexing Biology biology.organism_classification Sexual dimorphism White-throated sparrow Plumage embryonic structures Animal Science and Zoology education Ecology Evolution Behavior and Systematics |
| Zdroj: | The Wilson Journal of Ornithology. 118:326-332 |
| ISSN: | 1938-5447 1559-4491 |
| DOI: | 10.1676/05-047.1 |
| Popis: | White-throated Sparrows (Zonotrichia albicollis) display a plumage dimorphism (white-striped and tan-striped) with attendant behavioral differences, including greater aggression levels in white-striped birds and negative assortative mating, in which tan-striped birds pair with white-striped birds. To determine whether morph influences migration timing, which could influence patterns of assortative mating, we evaluated the phenology of northbound migration among White-throated Sparrows from a long-term banding dataset collected at a southern Ontario banding station. White-throated Sparrows are sexed by wing-chord length, but there is an intermediate size for which sex cannot be assigned. When all birds were considered together (both known and unknown sexes, n = 6,243), the white-striped birds migrated earlier by slightly more than 2 days. The sexing criteria, however, appeared to yield a sample that was not representative of the whole population: when we included only birds for which sex was assig... |
| Databáze: | OpenAIRE |
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